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-rw-r--r--src/3rdparty/libwebp/src/dec/buffer.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/src/3rdparty/libwebp/src/dec/buffer.c b/src/3rdparty/libwebp/src/dec/buffer.c
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+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Everything about WebPDecBuffer
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include <stdlib.h>
+
+#include "./vp8i.h"
+#include "./webpi.h"
+#include "../utils/utils.h"
+
+//------------------------------------------------------------------------------
+// WebPDecBuffer
+
+// Number of bytes per pixel for the different color-spaces.
+static const int kModeBpp[MODE_LAST] = {
+ 3, 4, 3, 4, 4, 2, 2,
+ 4, 4, 4, 2, // pre-multiplied modes
+ 1, 1 };
+
+// Check that webp_csp_mode is within the bounds of WEBP_CSP_MODE.
+// Convert to an integer to handle both the unsigned/signed enum cases
+// without the need for casting to remove type limit warnings.
+static int IsValidColorspace(int webp_csp_mode) {
+ return (webp_csp_mode >= MODE_RGB && webp_csp_mode < MODE_LAST);
+}
+
+static VP8StatusCode CheckDecBuffer(const WebPDecBuffer* const buffer) {
+ int ok = 1;
+ const WEBP_CSP_MODE mode = buffer->colorspace;
+ const int width = buffer->width;
+ const int height = buffer->height;
+ if (!IsValidColorspace(mode)) {
+ ok = 0;
+ } else if (!WebPIsRGBMode(mode)) { // YUV checks
+ const WebPYUVABuffer* const buf = &buffer->u.YUVA;
+ const uint64_t y_size = (uint64_t)buf->y_stride * height;
+ const uint64_t u_size = (uint64_t)buf->u_stride * ((height + 1) / 2);
+ const uint64_t v_size = (uint64_t)buf->v_stride * ((height + 1) / 2);
+ const uint64_t a_size = (uint64_t)buf->a_stride * height;
+ ok &= (y_size <= buf->y_size);
+ ok &= (u_size <= buf->u_size);
+ ok &= (v_size <= buf->v_size);
+ ok &= (buf->y_stride >= width);
+ ok &= (buf->u_stride >= (width + 1) / 2);
+ ok &= (buf->v_stride >= (width + 1) / 2);
+ ok &= (buf->y != NULL);
+ ok &= (buf->u != NULL);
+ ok &= (buf->v != NULL);
+ if (mode == MODE_YUVA) {
+ ok &= (buf->a_stride >= width);
+ ok &= (a_size <= buf->a_size);
+ ok &= (buf->a != NULL);
+ }
+ } else { // RGB checks
+ const WebPRGBABuffer* const buf = &buffer->u.RGBA;
+ const uint64_t size = (uint64_t)buf->stride * height;
+ ok &= (size <= buf->size);
+ ok &= (buf->stride >= width * kModeBpp[mode]);
+ ok &= (buf->rgba != NULL);
+ }
+ return ok ? VP8_STATUS_OK : VP8_STATUS_INVALID_PARAM;
+}
+
+static VP8StatusCode AllocateBuffer(WebPDecBuffer* const buffer) {
+ const int w = buffer->width;
+ const int h = buffer->height;
+ const WEBP_CSP_MODE mode = buffer->colorspace;
+
+ if (w <= 0 || h <= 0 || !IsValidColorspace(mode)) {
+ return VP8_STATUS_INVALID_PARAM;
+ }
+
+ if (!buffer->is_external_memory && buffer->private_memory == NULL) {
+ uint8_t* output;
+ int uv_stride = 0, a_stride = 0;
+ uint64_t uv_size = 0, a_size = 0, total_size;
+ // We need memory and it hasn't been allocated yet.
+ // => initialize output buffer, now that dimensions are known.
+ const int stride = w * kModeBpp[mode];
+ const uint64_t size = (uint64_t)stride * h;
+
+ if (!WebPIsRGBMode(mode)) {
+ uv_stride = (w + 1) / 2;
+ uv_size = (uint64_t)uv_stride * ((h + 1) / 2);
+ if (mode == MODE_YUVA) {
+ a_stride = w;
+ a_size = (uint64_t)a_stride * h;
+ }
+ }
+ total_size = size + 2 * uv_size + a_size;
+
+ // Security/sanity checks
+ output = (uint8_t*)WebPSafeMalloc(total_size, sizeof(*output));
+ if (output == NULL) {
+ return VP8_STATUS_OUT_OF_MEMORY;
+ }
+ buffer->private_memory = output;
+
+ if (!WebPIsRGBMode(mode)) { // YUVA initialization
+ WebPYUVABuffer* const buf = &buffer->u.YUVA;
+ buf->y = output;
+ buf->y_stride = stride;
+ buf->y_size = (size_t)size;
+ buf->u = output + size;
+ buf->u_stride = uv_stride;
+ buf->u_size = (size_t)uv_size;
+ buf->v = output + size + uv_size;
+ buf->v_stride = uv_stride;
+ buf->v_size = (size_t)uv_size;
+ if (mode == MODE_YUVA) {
+ buf->a = output + size + 2 * uv_size;
+ }
+ buf->a_size = (size_t)a_size;
+ buf->a_stride = a_stride;
+ } else { // RGBA initialization
+ WebPRGBABuffer* const buf = &buffer->u.RGBA;
+ buf->rgba = output;
+ buf->stride = stride;
+ buf->size = (size_t)size;
+ }
+ }
+ return CheckDecBuffer(buffer);
+}
+
+VP8StatusCode WebPAllocateDecBuffer(int w, int h,
+ const WebPDecoderOptions* const options,
+ WebPDecBuffer* const out) {
+ if (out == NULL || w <= 0 || h <= 0) {
+ return VP8_STATUS_INVALID_PARAM;
+ }
+ if (options != NULL) { // First, apply options if there is any.
+ if (options->use_cropping) {
+ const int cw = options->crop_width;
+ const int ch = options->crop_height;
+ const int x = options->crop_left & ~1;
+ const int y = options->crop_top & ~1;
+ if (x < 0 || y < 0 || cw <= 0 || ch <= 0 || x + cw > w || y + ch > h) {
+ return VP8_STATUS_INVALID_PARAM; // out of frame boundary.
+ }
+ w = cw;
+ h = ch;
+ }
+ if (options->use_scaling) {
+ if (options->scaled_width <= 0 || options->scaled_height <= 0) {
+ return VP8_STATUS_INVALID_PARAM;
+ }
+ w = options->scaled_width;
+ h = options->scaled_height;
+ }
+ }
+ out->width = w;
+ out->height = h;
+
+ // Then, allocate buffer for real
+ return AllocateBuffer(out);
+}
+
+//------------------------------------------------------------------------------
+// constructors / destructors
+
+int WebPInitDecBufferInternal(WebPDecBuffer* buffer, int version) {
+ if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_DECODER_ABI_VERSION)) {
+ return 0; // version mismatch
+ }
+ if (buffer == NULL) return 0;
+ memset(buffer, 0, sizeof(*buffer));
+ return 1;
+}
+
+void WebPFreeDecBuffer(WebPDecBuffer* buffer) {
+ if (buffer != NULL) {
+ if (!buffer->is_external_memory)
+ free(buffer->private_memory);
+ buffer->private_memory = NULL;
+ }
+}
+
+void WebPCopyDecBuffer(const WebPDecBuffer* const src,
+ WebPDecBuffer* const dst) {
+ if (src != NULL && dst != NULL) {
+ *dst = *src;
+ if (src->private_memory != NULL) {
+ dst->is_external_memory = 1; // dst buffer doesn't own the memory.
+ dst->private_memory = NULL;
+ }
+ }
+}
+
+// Copy and transfer ownership from src to dst (beware of parameter order!)
+void WebPGrabDecBuffer(WebPDecBuffer* const src, WebPDecBuffer* const dst) {
+ if (src != NULL && dst != NULL) {
+ *dst = *src;
+ if (src->private_memory != NULL) {
+ src->is_external_memory = 1; // src relinquishes ownership
+ src->private_memory = NULL;
+ }
+ }
+}
+
+//------------------------------------------------------------------------------
+
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